Paints for Lower Units?

Discussion in 'Materials' started by Fishbone, Aug 13, 2011.

  1. Fishbone
    Joined: Jul 2011
    Posts: 5
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: CW FLORIDA

    Fishbone Junior Member

    Wanting to repaint my lower unit with gloss whatever.
    Have sanded all the existing paint and primers off down to bare aluminum.

    #1) Should I spray a industrial epoxy primer on first and then top coat.

    #2) Spray an aluminum etch primer first, then a epoxy primer and top coat?

    #3) Who makes an industrial paint for this type of application?

    #4) What kind of paint is it? (epoxy, polyurethane, etc).

    Tried Rust Bullet for this process and it wasn't a pretty picture after the product cured.
    Product blisted up and actually pulled away from the LU during cure time.
    Sprayed the LU with etch primer first and top coated an hour later.
    Definitely not going that route again.

    My thoughts are industrial epoxy primer and an industrial epoxy top coat but not quite sure how well the top coat will hold up on a LU which will be under water for hours at a time.

    And, does the indusrial epoxy top coats come in gloss?

    Live in Florida if that makes any difference.

    Thanks for all the input in advance.
  2. pauloman
    Joined: Jun 2010
    Posts: 268
    Likes: 10, Points: 18, Legacy Rep: 151
    Location: New Hampshire

    pauloman Epoxy Vendor

    start with aluminum moisture cured urethane (MCU) such as aluthane (tm) then just topcoat with regular enamel.
  3. gonzo
    Joined: Aug 2002
    Posts: 14,555
    Likes: 684, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    The factory recommended system is :
    1 sand and acid wash
    2 zinc chromate
    3 epoxy primer
    4 Acrylic enamel
    1 person likes this.

  4. tunnels

    tunnels Previous Member

    Thank heavens someone is thinking !!:D:p
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.